Champion Cutting CS6X #1 6" Aircraft Extension Drill Bits 135 degree split point Black oxide treated HSS Single piece construction. Flute length is the same as a standard jobber drill
Champion - Bit Stub - 1/2 - Cobalt Referred to as screw machine drills Short flute; overall length increases their rigidity, resulting in better hole accuracy and extended tool life
SOWA 116-243 HSS Combined Drill and Countersink #6 - 3 inch Countersink are used to create holes for fasteners 60° countersink angle High-speed steel (HSS) HSS bits are hard and much more resistant...